primordium of parathyroid gland

例句：

1. 1. The primordium of the thyroid gland is located in the neck.
   甲状腺腺体的原始体位于颈部。
2. 2.The study of the primordium of the human brain has been a topic of interest for many years.
   对人类大脑原始体的研究多年来一直是人们感兴趣的话题。
3. 3.The primordium of the heart is the first chamber to form during fetal development.
   心脏的原始体是胎儿发育过程中形成的最初一个心室。